Absolute magnitude is a measure of a star's intrinsic brightness, meaning how bright it would appear if it were located 10 parsecs (32.6 light-years) away from Earth.
Constellations are groups of stars that appear close together in the sky from our perspective on Earth. They are not physically connected and can have vastly different distances and absolute magnitudes.
If you're interested in the absolute magnitude of individual stars within Cassiopeia, you can find this information online or in astronomical databases. For example, the brightest star in Cassiopeia is Schedar (Alpha Cassiopeiae), which has an absolute magnitude of -2.4.
